We report reversible electrochemical insertion of NO into manganese(II, III) oxide (Mn O ) as a cathode for aqueous dual-ion batteries. Characterization by TGA, FTIR, EDX, XANES, EXAFS, and EQCM collectively provides unequivocal evidence that reversible oxidative NO insertion takes place inside Mn O . Ex situ HRTEM and corresponding EDX mapping results suggest that NO insertion de-crystallizes the structure of Mn O . Kinetic studies reveal fast migration of NO in the Mn O structure. This finding may open a new direction for novel low-cost aqueous dual-ion batteries.
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